Flight history · Aug 2025 – Jul 2026 · US DOT on-time records
WN 4378 · Dallas (DAL) → Las Vegas (LAS)
Sold by Southwest. Still flying: 32 of the last 56 days (Mon, Thu, Fri, Sun).
Arrives on time38%within 15 minutes, of 34 flights
Cancelled0.0%of scheduled flights
An hour or more late26%of flights that operated
When late, on average61 minlate, among flights 15+ min late
Schedule
Typical times in the Jun 6 – Jul 31, 2026 schedule, local at each airport (Las Vegas is 2 h behind Dallas).
- Leaves DAL
- 22:45
- Arrives LAS
- 23:30
- Flight time
- 2h 48m
- Days flown, last 8 weeks
- 32 of 56
Each square is a day, Sat Jun 6 to Fri Jul 31, two weeks per row (each column is the same weekday); filled = flew.
How late it arrives
Share of flights that operated arriving more than this late.
Horizontal: minutes late at arrival (0 to 3 hours). Vertical: share of flights later than that.
Its hour at DAL
All flights leaving Dallas (DAL) at 10–11 pm, wherever they’re going: 44% left within 15 minutes and 1.3% were cancelled (1,594 flights in the year). Other Southwest flights on this route →
Upcoming forecasts
Our odds that this flight is late or cancelled on the days we publish.